A Compact Dual-Band 28/38 GHz Two-port MIMO Antenna for 5G mm-wave Applications

Abstract

This paper introduces a novel dual-band multiple-input multiple-output (MIMO) antenna is designed for applications of 28/38 GHz 5G mm-wave wireless communication. The proposed antenna is made on Rogers RT5880 material and has dimensions of 7 mm x 15 mm x 0.8 mm. The MIMO antenna employs rectangular slots positioned identically within the patch, along with the y-shaped slots in the ground, to achieve resonant frequencies at 28GHz and 38 GHz. To improve the isolation between each MIMO element, a rectangular slot is strategically positioned in between them. The designed dual-element MIMO antenna functions effectively at resonant frequencies of 28 GHz and 38 GHz and the isolation between its components is > 25 dB. The proposed antenna achieves return loss of -22dB at 28GHz and -24dB at 38 GHz, peak gains of 4.9 dBi at 28 GHz and 2.7 dBi at 38 GHz and the radiation efficiency of >75% within the operational frequency bands. The designed antenna results an envelope correlation coefficient (ECC) below 0.005 and diversity gain (DG) of almost 10 dB. The designing and simulation of the MIMO antenna are carried out through CST Software.